Safety-clutch for drill-feeds.



R. MILNE,

SAFETY CLUTCH FOR DRILL FEEDS. APPLICATION FILED MAR 18, 1909.

Patented Jan.4,1910. 2 SHEETS-SHEET l.

57 yz if i i z/ f Zia/8277 52: %f;% I, FaberTMi/Hc? R. MILNE. L SAFETYCLUTCH FOE DRILL FEEDS.

APPLICATION FILED MAR. 18, 1909. 945,571, v Patented Jan.4,1910.

z SHEETS-SHEET 1 lull/um Will/11W)! UNITED STATES PATENT OFFICE.

ROBERT MILNE, OF ROCKFORD, ILLINOIS, ASSIGNOB. TO ROCKFORD DRILLING MA-CHINE COMPANY, OF ROCKFORD, ILLINOIS, A CORPORATION OLE ILLINOIS.

SAFETY-CLUTCH FOR DRILL-FEEDS.

Specification of Letters Patent.

Patented Jan. 4, 1910.

Application filed March 18, 1909. Serial No. 484,205.

To all whom it may concern:

Be it known that I, RoBnRT MILNE, a citizen of the United States,residing at Rockford, in the county of \Vinnebago and State of Illinois,have invented certain new and useful Improvements in Safety-Clutches forDrill-Feeds, of which the following is a specification.

In the operation of drilling, breakage sometimes occurs by reason of thefailure of the operator to discontinue the feeding operationsimultaneously with the cessation of rotation of the drill spindle, withthe result that the drill is driven into the metal without rotation, sothat the bit, or some portion of the feed mechanism, will be broken ordamaged.

The object of the present invention is to provide a safety clutch whichwill be so arranged as to throw out the feeding mechanism simultaneouslywith the stop of the drilling mechanism, thereby coordinating theseoperations and preventing damage due to carelessness of operation.

Further objects will appear from a detailed description of theinvention, which consists in the features of construction andcombination of parts hereinafter described and claimed.

In the drawings, Figure l is a side elevation of the drill press withtapping attachment, showing the safety clutch of the present invention;Fig. 2 an enlarged detail of the tapping attachment with the safetyclutch attached thereto; and Fig. 3 a sectional plan View, showing theupper portion of the frame cut away.

The clutch of the present invention is applied to a drill press ofstandard formation, having a supporting post or column a, which carriesa table 5. The post or column, at its upper end, branches into a frontlower arm 6 and a rear arm 7, which latter, in turn, is forked toprovide a front upper arm 8 and a rear upper arm 9. The front lower armterminates in a sleeve 10 through which is slidably entered a feedingrack 11, which rotatably mounts a drill spindle 12. The rack is fed bymeans of a pinion, not shown, which is actuated by means of a worm wheel13 meshing with a worm 14, which is driven through gearing andconnections 15 of any suitable character. These features of constructionare standard, and a detailed description is deemed unnecessary.

The gearing 15 is driven by a cone 16, which is connected by a belt 17with a driving cone 18 loosely mounted upon a main driving shaft 19having a driving cone 20 keyed or otherwise rigidly secured thereto. Thedriving shaft is journaled upon the upper arms of the frame and hasslidably mounted thereon a grooved clutch member 21 which is engaged bya forkedblock 22 carried by a rod 23 which is slidably mounted within abracket 24 bolted, or otherwise secured to an arch frame 25, which iscarried by the upper arm 8 of the frame. The arch frame is provided witha forward journal sleeve 26 and a rear journal sleeve 27, the former ofwhich receives the upper end of the drill spindle 12. The arch frameserves to mount the gearing necessary to give a reversal to the rotationof the drill spindle and constitutes what is ordinarily termed a tappingattachment for the drilling machine proper.

The gearing whereby forward and reverse rotation is imparted to thedrill spindle comprises a bevel crown gear 28 which is loosely mountedupon the drill spindle immediately below a grooved clutch member 29,which is splined or otherwise slidably mounted upon the drill spindleand is adapted to be moved either up or down by the movement of aninverted L lever 30 the short end of which engages the groove in theclutch member. Immediately above the clutch member is a driven spurpinion 3l loosely mounted, which is provided with an elongated sleeve32, which is journaled through the sleeve 26, and carries, at its upperend, a collar 33, which prevents its displacement. The crown gear mesheswith a driven bevel gear 3st on the end of the driving shaft 19, inwhich is mounted an oppositely facing reversing bevel pinion 35, whichmeshes with a bevel pinion 36 on the lower end of a vertical stub shaft37, which is journaled through the sleeve 27 and carries a driving spurpinion 38 in mesh with the driven spur pinion 31. The stub shaft 37 isadapted to be lifted by the movement of an L lever 38 which serves tounmesh the bevel pinions; but the present invention is not concernedwith the details of construction of the levers and gears which might beotherwise arranged and located without changing the character of thepresent invention.

The rod 23, at its forward end, is pivoted to a lever 39, which ispivoted in its center 40 and is connected at its lower end with theclutch lever 30 by means of a bar d1 so hung that a forward movement ofthe clutch lever 30 will impart a rearward movement to the rod 23.

In use, with the parts shown in the position of Fig. 2, which is theneutral position, no rotation will be imparted to the drill spindle. Bydrawing forward the lower end of the lever 30 the clutch member 29 willbe moved downwardly on the drill spindle and into engagement with thecrown bevel gear 28, which is driven by the constantly rotating drivingshaft. This forward movement of the lever 30 will impart a rearwardmovement to the rod 23, which throws the clutch member 21, which isrevoluble with the driving shaft, into clutch with the feeding cone18,01 other feeding device which may be em ployed in place thereof, sothat, simultaneously with the forward rotation of the drill spindle, thefeeding action will begin and will continue until the work has beendrilled to the desired degree. Then this point is reached, the operatorthrows back the lever 30 into position to disengage the crown gear,thereby stopping the feed so that there will be no danger of feeding anon-rotating bit into the work as frequently happens where the feedingand drilling operations are individually controlled. When it is desiredto reverse the movement of the drill spindle, the lever 30 will bethrown in to its fullest extent, thereby raising the clutch member 29into engagement with the drill and spur pinion 31. During this reversemovement the feeding devices remain inactive, since in tappingoperations the bacl: feed of the bit will be automatic by reason of itsengagement with the threads already formed in a tapped hole.

The invention is one which is adapted for drilling machinery of manystandard types, and it is not the intention to limit the invention tofeeding mechanism or reversing gears of any particular kind, since thesefeatures can be changed or modified as occasion may require.

\Vhat I claim as new and desire to secure by Letters Patent is:

1. In a drilling machine of the character indicated, a drill spindle,feeding mechanism therefor, means for rotating the drill spindle, aclutch for engaging the drill spindle with said rotating means, a clutchfor actuating the feeding mechanism, and means for simultaneouslyactuating the two clutches, substantially as described.

2. In a drilling machine of the character indicated, a drill spindle,feeding mechanism therefor, means for rotating the drill eespvi spindle,a clutch for engaging the drill spindle with said rotating means, aclutch for actuating the feeding mechanism, a lever engaging one of theclutches, and a connection adapted to actuate the other clutch with themovement ofthe lever, substantially as described.

3. In drilling machinery of the character described, the combination ofa drill spindle, a gear loosely mounted thereon, a driving shaftprovided with a driving gear in mesh with the gear on the spindle, aclutch slidably mounted on the spindle and adapted to engage the looselymounted gear thereon, a feeding member loosely mounted upon the drivingshaft, a clutch slidably mounted upon the driving shaft and adapted toactuate said member, and means for simultaneously operating the twoclutches, means for feeding the drill spindle, and operative connectionsbetween said means and the feeding member on the driving shaft,substantially as described.

t. In drilling machinery of the character described, the combination ofa drill spindle, a gear loosely mounted thereon, a driving shaftprovided with a driving gear in mesh with the gear on the spindle, aclutch slidably mounted on the spindle and adapted to engage the looselymounted gear thereon, a feeding member loosely mounted upon the drivingshaft, a clutch slidably mounted upon the driving shaft and adapted toactuate said member, a lever engaging one of the clutches, and aconnection between the said lever and the other clutch, forsimultaneously operating the two clutches, means for feeding the drillspindle, and operative connections between said means and the feedingmember on the driving shaft, substantially as described.

5. In drilling machinery of the character described, the combination ofav drill spindle, a gear loosely mounted thereon, a driving shaftprovided with a driving gear in mesh with the gear on the spindle, aclutch slidably mounted on the spindle and adapted to engage the looselymounted ear thereon, a feeding member loosely mounted upon the drivingshaft, a clutch slidablymounted upon the driving shaft and adapted toactuate said member, an operating lever engaging the spindle clutch, arod connected with said lever, a pivoted lever with which the rear endof the rod is connected, a second rod connected with the opposite end ofsaid pivoted lever, and a member carried by said rod and engaging thefeeding clutch for imparting a rearward movement to the feed ing clutchwith a forward movement of the operating lever, means for feeding thedrill spindle, and operative connections between said means and thefeeding member on the driving shaft, substantially as described.

6. In drilling machinery of the character described, the combination ofa drill spindle, a gear loosely mounted thereon, a driving shaftprovided with a driving gear in mesh with the gear on the spindle, aclutch slidably mounted on the spindle and adapted to engage the looselymounted gear thereon, a feeding member loosely mounted upon the drivingshaft, a clutch slidably mounted upon the driving shaft and adapted toactuate said member, an operating lever of inverted L shape pivotedadjacent to the spindle clutch and having its short end in engagementtherewith and adapted to depress the clutch with a forward movement ofthe long arm of the lever, a rod connected with the long arm of saidlever, 21 pivoted lever with which the rear end of the rod is connected,a second rod connected with the opposite end of the pivoted lever, amember on said rod engaging the feeding clutch for imparting a rearwardmovement to the feeding clutch simultaneously with a downward movementof the spindle clutch, means for feeding the drill spindle, andoperative connections between said means and the feeding member on thedriving shaft, sl'ibstantially as described.

ROBT. MILNE.

WVitnesses VVALTER B. BoWIE, AMY DENMAN.

